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            <h1 style="display: none">Vue组件传值基本方法</h1>
            
            
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                <h1 id="Vue-组件传值"><a href="#Vue-组件传值" class="headerlink" title="Vue 组件传值"></a>Vue 组件传值</h1><h3 id="父组件向子组件传值"><a href="#父组件向子组件传值" class="headerlink" title="父组件向子组件传值"></a>父组件向子组件传值</h3><p>一般会在子组件里面定义 props 来做接收</p>
<h5 id="父组件"><a href="#父组件" class="headerlink" title="父组件"></a>父组件</h5><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div&gt;<br>    &lt;div&gt;我是父组件&lt;/div&gt;<br>    &lt;div&gt;我发送给第一个组件的信息是:&#123;&#123; msg &#125;&#125;&lt;/div&gt;<br>    &lt;div&gt;<br>      &lt;div id=&quot;child1&quot;&gt;<br>        &lt;ChildOne :msg=&quot;msg&quot; /&gt;<br>      &lt;/div&gt;<br>    &lt;/div&gt;<br>  &lt;/div&gt;<br>&lt;/template&gt;<br><br>&lt;script&gt;<br>import ChildOne from &#x27;../components/children1&#x27;<br>import ChildTwo from &#x27;../components/children2&#x27;<br>export default &#123;<br>  components: &#123;<br>    ChildOne,<br>    ChildTwo,<br>  &#125;,<br>  data() &#123;<br>    return &#123;<br>      msg: &#x27;我是父组件，我给你发消息&#x27;,<br>    &#125;<br>  &#125;,<br>&#125;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

<p>可以看到我在第一个子组件上面传入了一个 msg,那么在子组件上就需要定义一个 msg 用来接收传进来的参数</p>
<h5 id="这是第一个子组件"><a href="#这是第一个子组件" class="headerlink" title="这是第一个子组件"></a>这是第一个子组件</h5><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div&gt;<br>    &lt;div id=&quot;title&quot;&gt;我是第一个子组件&lt;/div&gt;<br>    &lt;div&gt;我接受到的父组件的消息是：&#123;&#123; msg &#125;&#125;&lt;/div&gt;<br>  &lt;/div&gt;<br>&lt;/template&gt;<br><br>&lt;script&gt;<br>export default &#123;<br>  props: &#123;<br>    msg: &#123;<br>      type: String,<br>    &#125;,<br>  &#125;,<br>&#125;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

<h3 id="子组件向父组件传值"><a href="#子组件向父组件传值" class="headerlink" title="子组件向父组件传值"></a>子组件向父组件传值</h3><p>这时候就需要利用 vue 中的$emit 将想要传递的值通过函数的形式传出，在父组件接收</p>
<p><code>this.$emit(arg1,arg2) arg1:方法名字，arg2:要传出的值</code></p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div&gt;<br>    &lt;div id=&quot;title&quot;&gt;我是第二个子组件&lt;/div&gt;<br>    &lt;div&gt;我要发送给父组件的值：&#123;&#123; msg &#125;&#125;&lt;/div&gt;<br>    &lt;button @click=&quot;toParent&quot;&gt;向父组件发送信息&lt;/button&gt;<br>  &lt;/div&gt;<br>&lt;/template&gt;<br><br>&lt;script&gt;<br>export default &#123;<br>  data() &#123;<br>    return &#123;<br>      msg: &#x27;我是第二组件，我要给父组件传值&#x27;,<br>    &#125;<br>  &#125;,<br>  methods: &#123;<br>    toParent() &#123;<br>      this.$emit(&#x27;toParent&#x27;, this.msg)<br>    &#125;,<br>  &#125;,<br>&#125;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

<p>我在 button 上绑定了一个点击事件，函数里面传出了一个方法名为 toParent 的方法，这时候我们就要去父组件接收这个函数，它会带一个返回值，这个返回值就是我们需要从子组件传的值。</p>
<h5 id="这是父组件"><a href="#这是父组件" class="headerlink" title="这是父组件"></a>这是父组件</h5><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div&gt;<br>    &lt;div&gt;我是父组件&lt;/div&gt;<br><br>    &lt;div&gt;我即将接收第二组件传值是：&#123;&#123; child2Msg &#125;&#125;&lt;/div&gt;<br>    &lt;div&gt;<br>      &lt;div id=&quot;child2&quot;&gt;<br>        &lt;ChildTwo @toParent=&quot;getMag&quot; /&gt;<br>      &lt;/div&gt;<br>    &lt;/div&gt;<br>  &lt;/div&gt;<br>&lt;/template&gt;<br><br>&lt;script&gt;<br>import ChildOne from &#x27;../components/children1&#x27;<br>import ChildTwo from &#x27;../components/children2&#x27;<br>export default &#123;<br>  components: &#123;<br>    ChildOne,<br>    ChildTwo,<br>  &#125;,<br>  data() &#123;<br>    return &#123;<br>      child2Msg: &#x27;&#x27;,<br>    &#125;<br>  &#125;,<br>  methods: &#123;<br>    getMag(msg) &#123;<br>      this.child2Msg = msg<br>    &#125;,<br>  &#125;,<br>&#125;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

<p>此时我在父组件里面定义了一个@toParent 方法这个名称要和子组件里面 this.$emit(arg1)的命名一样，用来接收。在 getMag 里面接收一个参数就是当前传回的值。</p>
<h3 id="兄弟组件传值"><a href="#兄弟组件传值" class="headerlink" title="兄弟组件传值"></a>兄弟组件传值</h3><p>兄弟组件之间就需要一个中间值，我在这里称为 bus。在 vue 文件 main.js 中，我们利用 <code>Vue.prototype.bus=new Vue()</code> 来定义，此时我们就有了一个中间量。</p>
<h5 id="这是第一个子组件-–-从这里向另外一个子组件传值"><a href="#这是第一个子组件-–-从这里向另外一个子组件传值" class="headerlink" title="这是第一个子组件 – 从这里向另外一个子组件传值"></a>这是第一个子组件 – 从这里向另外一个子组件传值</h5><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div&gt;<br>    &lt;div id=&quot;title&quot;&gt;我是第一个子组件&lt;/div&gt;<br>      我要给第二个兄弟发信息，内容是：<br>      &lt;input type=&quot;text&quot; v-model=&quot;to&quot; /&gt;<br>    &lt;/div&gt;<br>    &lt;button @click=&quot;toBrother&quot;&gt;点我给兄弟传值&lt;/button&gt;<br>  &lt;/div&gt;<br>&lt;/template&gt;<br><br>&lt;script&gt;<br>export default &#123;<br>  data() &#123;<br>    return &#123;<br>      to: &quot;哈喽老二&quot;<br>    &#125;;<br>  &#125;,<br>  methods: &#123;<br>    toBrother() &#123;<br>      this.bus.$emit(&quot;toBrother&quot;, this.to);<br>    &#125;<br>  &#125;<br>&#125;;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

<p>在这里我在 button 上绑定了一个方法，在方法内部使用中间变量 bus 中的$emit 来传递值，参数同子传父的参数一致。</p>
<h5 id="这是第二个子组件–用来做接收方"><a href="#这是第二个子组件–用来做接收方" class="headerlink" title="这是第二个子组件–用来做接收方"></a>这是第二个子组件–用来做接收方</h5><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><code class="hljs vue">&lt;template&gt;<br>  &lt;div&gt;<br>    &lt;div id=&quot;title&quot;&gt;我是第二个子组件&lt;/div&gt;<br>    &lt;div&gt;我得到的兄弟组件信息是：&#123;&#123; get &#125;&#125;&lt;/div&gt;<br>  &lt;/div&gt;<br>&lt;/template&gt;<br><br>&lt;script&gt;<br>export default &#123;<br>  data() &#123;<br>    return &#123;<br>      get: &quot;&quot;<br>    &#125;;<br>  &#125;<br>  beforeCreate() &#123;<br>    this.bus.$on(&quot;toBrother&quot;, msg =&gt; &#123;<br>      this.get = msg;<br>    &#125;);<br>  &#125;<br>&#125;;<br>&lt;/script&gt;<br></code></pre></td></tr></table></figure>

<p>在第二个子组件里面通过 beforeCreate 生命周期来获得传过来的值，这时候需要用<code>this.bus.$on</code>来接收，第一个参数是<code>this.bus.$emit</code>定义的第一个方法名，第二个参数是一个方法，此方法带一个返回参数。在这里我使用箭头函数。</p>

                
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